> This looks like a bizarre rendition of the Error/Exception monad.

Yes, of course.  *Hal slaps himself*

Thanks.

> Also, your motivating example is ambiguous.  I think you mainly care
> about the case where the test is testing for some "exceptional"
> condition.  I personally wouldn't want to use this style every place I
> would use an if.

Definitely not!  :)

 - Hal
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